abc's john schriffen takes us inside. >> reporter: it's being advertised as the ultimate man cave and real estate broker hoyt murphy says it's not what's on the surface but below that counts. >> this is where you could have your theater room or antique car storage. >> reporter: the nearly 8,000 square foot underground lair was originally built by at&t in the late '60s as a bomb shelter in south florida. today, murphy sees it as a survivalist's dream home. >> these are the two eight-foot-tall intake air shafts. >> reporter: while the pictures aren't so pretty, a little imagination and elbow grease could go a long way. just picture sprucing up this room with a pool table, bar and entertainment center. stockpiling this room with your prized video games or the ultimate stash of your favorite snacks and, best of all, using this space for your batmobile. well, more likely your sweet sports car. >> even though it's not functional anymore, you got to love the buttons. it looks like a science fiction movie set in here. >> reporter: with 30 inches of concrete protection and generators strong en